Discussion
Which of the following combination provide highest temperature?
Answer: C
The highest temperature comes from oxy-acetylene.
An oxy-acetylene flame reaches about 3,100 °C to 3,300 °C, the hottest of the common fuel-gas flames, which is why it is the standard gas for welding steel. Acetylene releases a great deal of heat on burning because of its triple bond, and pure oxygen avoids diluting the flame with nitrogen.
Oxy-hydrogen (about 2,800 °C) and oxy-LPG (about 2,800 °C to 2,900 °C) are cooler. Air-acetylene is much cooler still, because the nitrogen in the air absorbs heat.
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